Bobbinless loom for weaving ribbons



Jan. 15, 1957 G. VALLAGUZZA BOBBINLESS LOOM FOR WEAVING RIBBONS 2Sheets-Sheet 1 Filed Feb. 25, 1948 FIG Jan. 15, 1957 e. VALLAGUZZABOBBINLESS LOOM FOR WEAVING RIBBONS 2 Sheets-Sheet 2 Filed Feb. 25, 1948IOI ' BOBBINLESS LOOM FOR WEAVING RIBBONS Gisberto Vallaguzza, Milan,Italy; Idelbe Vallaguzza, legal heir of said Gisberto Vallaguzza,deceased Application February 25, 1948, Serial No. 10,688 In ItalyDecember 16, 1946 Section 1, Public Law 690, August a, 1946 Patentexpires December 16, 1966 7 Claims. (Cl. 139-124) The present inventionrelates to weaving looms for tapes, ribbons and like products.

More particularly, the invention relates to a loom designed for theweaving of narrow fabrics wherein a reciprocating needle replaces theusual shuttle. The needle cooperates, in a manner known per se,'with aselvedge spool. paying out a selvedge thread which is interlooped with aweft thread entrained by the needle, thereby producing a finished edgeat the side of the fabric remote from the location of the support forthe needle.

An object of the present inventionis to provide means for soreciprocating the needle that its movement proceeds in a more convenientdirection, i. e. along a trajectory having the configuration of a flatcurve located, preferably in the plane of the warp threads, it havingbeen found that under such conditions a smoother selvedge will beobtained under avoidance of undesired loops and other irregularities.

Another object of this invention is to provide means for feeding outselvedge thread from a sufficiently large spool to avoid frequentinterruption of the looms operation.

A further object of the invention is to provide means for keeping morenearly constant the tension of the weft and/or selvedge threads.

It is also an object of the present invention to provide means enablingreduction in the size and in the power requirement of a loom of thecharacter described, as well as means affording an increase in output.

According to a further feature of the invention, the needle isreciprocated by means of an articulated frame to which it is secured,the frame including a plurality of parallel arms separately pivoted on asupport.

The above and other objects and features of the invention will becomeapparent from the following detailed description of certain embodiments,reference being had to the accompanying drawings in which:

Fig. 1 is a perspective view, partly in section, of an embodiment of theinvention, showing the principal elements thereof;

Fig. 2 is a perspective view, on a larger scale, of those elements ofthe loom shown in Fig. 1 which participate more immediately in theweaving of the fabric;

Fig. 3 is a top plan view of certain of the elements shown in Fig. 2,including the drive means for reciproeating the needle;

Fig. 4 is a top plan view similar to the left-hand portion of Fig. 3,illustrating a modified form of drive means; and

Fig. 5 is an axial section of a preferred form of a needle adapted to beused in either of the systems shown in Figs. 1-3 and Fig. 4.

Referring first to Figs. 13, there is shown a loom 30 (Fig. 1) for theweaving of narrow fabrics, comprising a needle 1, reciprocable in ahorizontal plane in the manner more fully explained hereinafter. Aselvedge spool 2 is rotatably mounted in a housing 2a which is 2,777,470Patented Jan. 15, 1957 journalled in the loom frame 29 for rotation froma beltdriven pulley 9, via a horizontal shaft 8, bevel gears and 11, avertical shaft 12 carrying a flywheel 20, a crank 21, a link 22, a crank23, a vertical shaft 24, gears 25, 26, 27 and a stud shaft 28. A lay 31,pivotally mounted at 32, carries the reed 5 adapted to oscillate betweenthe spool housing 211 and the needle 1. Warp threads F (Figs. 2 and 3),controlled by conventional harnesses (not shown) pass horizontallythrough the reed 5. The reed 5 operates to beat up the weft threads W,entrained by the needle 1, in a manner well known per se.

Fixed on the vertical shaft 12 are two cams 40, 40a

engaged by two roller-carrying arms 41, 41a together constituting a bellcrank lever pivoted on the loom frame 29 at 42. Another arm 43, integralwith the arms 41 and 41a, is linked via a connecting rod 44 with an arm45 which, together with a similar arm 46 and a bar 47 interconnectingthese two arms 45 and 46, forms an articulated frame. Arms 45 and 46which are parallel to each other are pivoted at 48, 49, respectively, onthe loom frame 29 forming a stationary support. Needle 1 is rigidlysecured to the bar 47 by tight fit (within an opening of said bar),which is aided by a set screw clamping said needle in place, as shown.

In Fig. 3 there has been shown in full lines a first or retractedposition of the articulated frame 45-46-47, two further positions beingindicated in dotted lines. They include an intermediate position inwhich the parallel arms occupy the positions shown at 45, 46', and anextreme position in which the positions 45', 46' of these arms areindicated at 45", 46" and in Which the needle 1 fully penetrates thewarp threads F to move into cooperation with the selvedge spool 2. Itwill be noted that the trajectory of the point or eye of the needle 1 isa flat curve as indicated at R.

The spool 2 may be generally similar to those conventionally provided insewing machines, hence its construction and operation need not bedescribed in detail. According to a feature of the invention, however,this spool is provided with a spring 50 adapted to pay out additionalselvedge thread S when needed and to take up the slack occurring atcertain stages of the operation whereby a substantially constant tensionis imparted to the thread S and breaking of the thread, as upon strikingthe bulging housing 2a, is prevented.

In the embodiment of Fig. 4, the parallel rods are shown at 88, 89 andtheir pivots at 90, 91, respectively. The linkage 47a supporting theneedle 1' corresponds to the bar 47 of the preceding embodiment. Mountedon the shaft 12a are the cams 96 and 97, engaged by the roller-carryingarms 92 and 93, respectively, which, together with a third arm 94 form aunit pivoted on the shaft 42a. Arm 94 is coupled with the arm 88 via aconnecting rod 95. The shaft 12a also carries a disk 98a on which ispivoted, at 98, a guide arm 99 for the weft thread which is fulcrumed tothe loom frame 2% at 99a.

Fig. 5 illustrates a preferred construction of the needle shown at 1 inFigs. l-3 and at 1 in Fig. 4. According to Fig. 5 the needle comprises ametal rod 100 provided with a ring or eye 101 which is preferably coatedwith a refractory (e. g. vitreous or ceramic) material, the rod beinglodged in the bore of a tubular metal housing 102 and being providedwith a collar to which are anchored a pair of springs 103, 104 acting inopposition to each other. It will be understood that the springs 103,104 resiliently tend to retain the rod 100 in a predetermined positionrelative to the housing 102, as shown in the drawings.

It will be understood that the dimensions, constructional details,relative arrangement, etc. of the elements disclosed as well as theircombination with conventional loom elements, may be varied and that theinvention may be modified in various ways Without thereby departing fromthe scope of the invention as defined in the appended claims. i Havingthus described the invention, what is claimed as new and desired to besecured by Letters Patent, is:

1. A weaving loom for tapes, ribbons and like products, comprising aselvedge spool, a reciprocating needle cooperating with said selvedgespool for interlooping a weft thread entrained by said needle with aselvedge thread payed out by said spool, and mechanism for reciprocatingsaid needle with respect to said spool, said mechanism including astationary support, a plurality of parallel arms separately pivoted onsaid support, link means interconnecting said arms for parallelmovement, said link means and said arms constituting an articulatedframe, means rigidly securing said needle to said link means, and drivemeans coupled with said frame for oscillating said frame with respect tosaid support.

2. A loom according to claim 1, wherein said drive means comprises arotatable shaft, cam means on said shaft, and a lever pivoted on saidsupport and provided with three extremities, two ofsaid extremitiesengaging said cam means from opposite sides, the third of saidextremities being coupled with one of said arms.

3. A loom according to claim 1, including a housing for said selvedgespool, said spool being rotatable in said housing and being providedwith spring means imparting tension to a selvedge thread leaving saidhousing.

4. A loom according to claim 1, wherein means are provided forsupporting a set of warp threads between said support and said selvedgespool, said warp threads lying in one plane, said articulated framebeing mounted on said support for oscillating in said plane.

5. A loom according to claim 4, wherein said articulated frame ismounted on said support for horizontal oscillations.

6. A' loom according to claim 1, wherein said needle comprises a casinghaving a bore, a rod lodged in said bore and having an end projectingfrom said casing, said end being provided with an eye, and spring meansin said bore tending to maintain said rod in a predetermined positionrelative to said casing.

7. A loom according to claim 6, wherein said casing and said rod are ofmetal, said eye being coated with a refractory material.

References Cited in the file of this patent UNITED STATES PATENTS639,018 Brun Dec. 12, 1899 653,274 Weaver July 10, 1900 719,666 HerzigFeb. 3, 1903 740,903 OReilly Oct. 6, 1903 1,391,958 Kendrick Sept. 27,1921 1,526,990 Krenz Feb. 17, 1925 FOREIGN PATENTS 21,177 Great Britainof 1909

